Bullying by 2 Directors on 1 Director in a Pvt Ltd Company

A, B and C started a Pvt Ltd Company to run a manufacturing business. All parties have 33.33% each, no one has 34% share and have distributed the shares to their respective family members. A has 15 years experience in the industry. A, B and C sign an MOU to insure the business operations is taken care by A as other two directors are inexperienced. However, 4 members from B's family and 3 members from C's family intervene in A's department regularly causing him difficulties in running the business smoothly. Now, A son is disabled and his daughter and son-in-law shift to the city to help him seeing his growing age. But B and C disturb them and do not let them enter the factory. B's son insulted A's son in law in front of staff and when he asked him to shut up, he put false allegations on A's son-in-law of trying to hit him. They pressurized A by threatening him to shut down the factory if he did not agree. He got pressurised and accepted this demand. B's son regularly intervened, behaved unprofessionally, insulted A, removed him from Net Banking portal and withdrawn large some of money from company funds. The next day A took his son-in-law with him to office as A was unwell due to stress caused to him. B brought his brother and two unknown men to the office, secretly told one of the staff to turn of the CCTV and intimidated, humiliated and even tried to assault A. B even told the staff to leave and clients to look for other business to work with. What should A do now?